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Population and exponential growth with Dr. Albert Bartlett
Bartlett says the most important thing we are ignoring is the simple mathematical principle of exponential growth. Find videos about it here.
September 18, 2008
Could lunar dust be toxic to astronauts?
As NASA prepares to return to the moon by the year 2020, a scientist is studying a space hazard - lunar dust.
September 17, 2008
A U.S. forest overview for the early 21st century
Forests can't be left alone to take care of themselves, says Sally Collins of the U.S. Forest Service.
September 16, 2008
US forests face threat from development
America is losing 6,000 acres of open land - much of it forests - to development each day, says Sally Collins of the U.S. Forest Service.
September 15, 2008
How to read produce labels – find out here
Just about every piece of fruit has a little sticker on it, and every vegetable has a scanning label associated with it. Learn how to read produce labels.
September 12, 2008
Why are some galaxies shaped liked spirals?
Astronomers believe that galaxies have spiral arms - in part - because galaxies rotate, or spin around, a central axis.
September 11, 2008
What happens when distant worlds collide
There are still mysteries in astronomy, says Eric Mamajek. He talks about a surprisingly hot object 170 million light years from Earth that could be the result of a collision between two distant planets.
September 10, 2008
Clouds and Earth’s energy balance
NASA's Bruce Wielicki talks about how clouds affect the energy Earth receives, keeps, and emits back to space - what scientists call Earth's energy balance - in this 8-minute EarthSky podcast
September 10, 2008
How many stars are in the Milky Way?
How many stars in the Milky Way? The estimate for the number of stars in the Milky Way is about 100 billion stars - plus or minus 50 billion.
September 9, 2008
The Large Hadron Collider – LHC – black holes and energy
The atoms in the body of an average person corresponds to about 1.6 gigatons of TNT in energy. The likelihood of spontaneous explosion is low, similar to that of the Large Hadron Collider to cause any harm.
September 9, 2008
